Mechanism for preventing offset in printing machines.



Na. 633,898. Patented Sept. 26, I899.

0'. E. PATTBERG.

IECHANISN FOR PREVENTING OFFSET IN PRINTING MACHINES.

(Application filed Inn. 29, 1897.)

(No Indal.)

v f 3 E l\ we Q N v Witnesses. Inventon v c. Elgffttberg. -JZB KMA v WYW Atto rn 63 5 I UNITED. STATES PATENT @Trriosr CHARLES E. PAT'l-BERG,OFYORK, N, Y.

MECHANISM FOR PREVENTING OFFSET IN PRlNTlNG-MACHlNES.

SPECIFICATION forming part of Letters Patent No. 633,898, datedSeptember 26, 1899. Application filed January 29,1s97. Serial No.621,147. on model) To all whom it may concern:

Be it known that'I, CHARLES E. PATTBERG, a citizen ofthe United States,residing at New York, in the county of New York and State of New York,have invented a new and useful Improvementin Attachments forWeb-Printing Machines, of which the following is a specification. I

The aim of this invention is to provide any of the forms of web-printingmachines with an attachment or means whereby ofiset will be preventedand whereby the perfected web will be prevented from blurring as thesame is drawn or led over the various rollers and mechanisms beyond theprinting mechanism.

In my Patent No. 613,045,.dated October 25, 1898, I have shown andclaimed a device wherein an ink drying medium, such as finely-poweredtalc or French chalk, may be deposited on the first printed side of theWeb in a web-printing machine before the web is led to the secondimpression-cylinder or printing mechanism, so as to prevent ofi'set fromthe said second impression-cylinder.

In the present application I further carry out this invention byproviding means whereby this offset-preven ting mediumwill be applied tothe second printed surface of the web and also preferably again to thefirst printed side of the web, so that the Web passing over thesubsequent rollers'and folding mechanism will not have either sideblurred.

I have found that by using a mixture of the character referred to notonly will all the ink be kept on the web, but a highly-lustrous efiectwill be given thereto.

The ordinary ofiset-preventingdevice acts somewhat on the principle of apiece of blotting-paper, absorbing the surplus ink, thus rendering theletters orimpression cloudy,

which of course is undesirable.

My invention works upon the opposite principle-that is, of keeping allthe ink possible upon the work and setting or drying the ink by thedrying medium which is applied thereto.

I will furtherdescribe my invention as applied to an ordinary form ofrotary webprinting machine.

In the accompanying drawing I have shownin section how my invention maybe applied thereto.

Referring to said drawing and in detail,-

A designates .the first printing-cylinder, B

the first impression-cylinder, O the second impression-cylinder, and Dthe second print-. ing-cylinder, of a web-printing press. The cylindersA and B print on one side of the web and form the parts I term the firstprinting mechanism, and the cylinders O and D print on the other side ofthe Web and form the parts I term the second printing mechanism.

Ooacting with the impression-cylinder A is a suitable inking device E,and coacting with the printing-cylinder D is a suitable inking device E.

The web to is drawn from a web-roll WV, being pulled therefrom by meansof a drawing-in device,which consists ofa contin uouslyrotating drum 10and a set of tapes 13, which run around tape-pulleys 11, 12, and 14.From the drawing-in device the web passes between the cylinders A and B,then to the cylinder 0, between the latter and the cylinder D, thenaround guiding-rollers 15 and 16, and between the rollers 17 and 18 toany suitable folding device, which is designated as F.

H represents a suitable hopper, in which are mounted a number ofrollers, as 20 and 21, the last roller of which bears on the firstimpression-cylinder B. Powdered talc or chalk is placed in this hopperand is carried by the action of the rollers up to and deposited upon thefirst printed side of the web while the same lies upon the firstimpressioncylinder B.

22 represents a suitable casing in which is mounted a rotary brush 23,the purpose of which is to remove the surplus talc or chalk from the Webbefore the same passes to. the second impressiomcylinder (J.

28 designates another hopper, in which is mounted a roller 29 and inwhich the roller 15 is housed, and the roller 15 also serves to deposittalc immediately upon the side of the .web which is last printed.

in suitable casings 31 and 33, so as to remove the surplus talc from theweb as the same issues from between the rollers 15 and 27. Suitableknives or blades, as 19, maybe arranged in the said hoppers to cooperatewith the rol1- ers 20, 26, and 29, and these blades maybe provided withadjusting-screws 190, so that the amount of talc carried in can beregulated. The various rollers may be covered with any suitable mediumwhich will convey talc such, for example, as felt or soft rubber. Bythis construction it will be seen that the ink deposited upon the web bythe plates on the cylinder A will have an immediate applica tion of talcfrom the roller 21, so that set-off on the second impression-cylinder Cwill be substantially prevented. Also it will be seen that the secondprinted side of the web after the same emerges from between thecylinders O and D will immediately have talc or chalk deposited thereonbefore the same touches any roller or guide, so that the second printedside of the Web will be immediately dried and prevented from beingblurred or defaced in any manner as the web is drawn around thesubsequent rollers and passed through the folding device.

I do not always use the hopper 24: and its rollers, but the same isdesirable in many instances to insure the first printed side beingperfectly dry before the Web passes to the subsequent rollers andfolding device. By this construction the printed product will be of avery high character.

The various rollers and parts herein shown are supposed to be driven byany of the usual forms of gearing which will be applied by the ordinaryprinting-press mechanic and need not be herein shown or detailed to givea clear understanding of my invention. The details and particulararrangements may also be varied as desired to suit the particularmachine to which my invention is applied.

I-Iaying thus fully described my invention, what I claim and desire tosecure by Letters Patent, is

1. The combination with the first printingcyliuder and the firstimpression-cylinder and the second printing and impression cylinders ofa tank and rollers arranged beneath the first impression-cylinder toapply an ink-dry ing substance to the Web as it passes under the firstimpression-cylinder, a second set of rollers beneath the secondimpression-cylin der through which the Web passes to the foldingmechanism to be supplied with an inkdrying material after it receivesthe second impression, and adjustable blades acting on the lowermost ofeach set of rollers to regulate the amount of material carried therebyto the uppermost rollers all substantially as shown and described.

2. In a printing-machine, the combination of two impression-cylindersone upon each side of the web to be printed and means located on thesame side of the Web or sheet as the second impression-cylinderforapplying an offset-preventing medium to the first printed surface of thesheet or Web before the same reaches the second impression-cylinder andmeans located on the other side of the web or sheet for applying anoffset-preventing, medium to the second printed surface of the saidsheet, substantially as and for the purpose specified.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

CHAS. E. PATTBERG.

Witnesses:

A. A. W. W001), i W. W. Games.

